Seunghwan was born on Saturday, December 10, 1994. He’s the oldest member of Romeo. He’s older than the maknae, Kangmin, by 4 years, 8 months, and 26 days.

He was born in the Chinese Year of the Dog and his zodiac star sign is Sagittarius. His blood type is A. Like fellow member Yunsung, he’s 176 cm or 5'9½" tall.

He went to Ilsan Haengshin High School.

As the leader, he talks the most during interviews. He takes care of the other members, but sometimes his nagging annoys them. He’s the most charismatic member. As the first member to come of age, he shows off sexy dance performances onstage.